Author: Fabio Domenico De Marco

Illustration of the techniques used for cost function minimization and interpolation in the new implementation of UMPA

Composite image showing the diverse directional dark-field information extracted from the examined sample, a series of hollow carbon fibre composite tubes. The main scattering direction, which is orthogonal to the fibers and thus the axes of the cylinders, is shown by the hue, while the overall scattering strength is encoded by the “value” of the colors (i.e., weak or no scatter appears as black), and the degree of the signal’s directionality is given by the colors’ saturation. Image from the paper, CC BY 4.0.

Photo and UMPA-processed image signals of a speckle-based dataset of a small flower, measured with the new sample-stepping technique at P05, PETRA III, DESY. The sample is much larger than the detector field of view (shown as the red rectangle).